OFFSET
1,1
COMMENTS
Column 5 of A252828
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (29/130767436800)*n^15 + (29/1743565824)*n^14 + (761/1437004800)*n^13 + (4567/479001600)*n^12 + (156803/1437004800)*n^11 + (467/537600)*n^10 + (4895111/914457600)*n^9 + (8221817/304819200)*n^8 + (969313/9331200)*n^7 + (3241009/10886400)*n^6 + (129913907/179625600)*n^5 + (29795933/19958400)*n^4 + (1495061807/454053600)*n^3 + (185734933/50450400)*n^2 + (148987/27720)*n
EXAMPLE
Some solutions for n=4
..0..1..1..2..3....0..1..1..2..2....0..1..2..3..3....0..1..2..2..2
..1..2..2..3..3....0..1..1..2..3....1..2..3..3..3....1..1..2..2..3
..2..2..3..3..3....1..1..1..2..3....1..2..3..4..4....1..2..3..3..4
..3..3..3..4..4....1..2..2..3..4....1..2..3..4..4....2..3..4..4..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2014
STATUS
approved